What’s Vulnerable › Vulnerabilities
CVE-2020-28473: Web Cache Poisoning
- Severity: medium (CVSS 5.8 v2.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.8% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-01-18 · updated 2026-06-17
- Weakness: CWE-444
Description
The package bottle from 0 and before 0.12.19 are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.
Affected products
- Bottlepy Bottle: before 0.12.19 — fixed in 0.12.19
- Debian Linux: 9.0
How to fix
Upgrade to a fixed version: Bottlepy Bottle 0.12.19. Check the vendor advisory for mitigations.
References
- https://github.com/bottlepy/bottle
- https://lists.debian.org/debian-lts-announce/2021/01/msg00019.html
- https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/
- https://snyk.io/vuln/SNYK-PYTHON-BOTTLE-1017108
- https://github.com/bottlepy/bottle
- https://lists.debian.org/debian-lts-announce/2021/01/msg00019.html
- https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/
- https://snyk.io/vuln/SNYK-PYTHON-BOTTLE-1017108
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